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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.primitives;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkElementIndex;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import static com.google.common.base.Preconditions.checkPositionIndexes;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.annotations.GwtCompatible;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.Serializable;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.AbstractList;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Arrays;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Collection;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Collections;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.List;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.RandomAccess;<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>/**<a name="line.34"></a>
<span class="sourceLineNo">035</span> * Static utility methods pertaining to {@code byte} primitives, that are not<a name="line.35"></a>
<span class="sourceLineNo">036</span> * already found in either {@link Byte} or {@link Arrays}, &lt;i&gt;and interpret<a name="line.36"></a>
<span class="sourceLineNo">037</span> * bytes as neither signed nor unsigned&lt;/i&gt;. The methods which specifically<a name="line.37"></a>
<span class="sourceLineNo">038</span> * treat bytes as signed or unsigned are found in {@link SignedBytes} and {@link<a name="line.38"></a>
<span class="sourceLineNo">039</span> * UnsignedBytes}.<a name="line.39"></a>
<span class="sourceLineNo">040</span> *<a name="line.40"></a>
<span class="sourceLineNo">041</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.41"></a>
<span class="sourceLineNo">042</span> * "http://code.google.com/p/guava-libraries/wiki/PrimitivesExplained"&gt;<a name="line.42"></a>
<span class="sourceLineNo">043</span> * primitive utilities&lt;/a&gt;.<a name="line.43"></a>
<span class="sourceLineNo">044</span> *<a name="line.44"></a>
<span class="sourceLineNo">045</span> * @author Kevin Bourrillion<a name="line.45"></a>
<span class="sourceLineNo">046</span> * @since 1.0<a name="line.46"></a>
<span class="sourceLineNo">047</span> */<a name="line.47"></a>
<span class="sourceLineNo">048</span>// TODO(kevinb): how to prevent warning on UnsignedBytes when building GWT<a name="line.48"></a>
<span class="sourceLineNo">049</span>// javadoc?<a name="line.49"></a>
<span class="sourceLineNo">050</span>@GwtCompatible<a name="line.50"></a>
<span class="sourceLineNo">051</span>public final class Bytes {<a name="line.51"></a>
<span class="sourceLineNo">052</span>  private Bytes() {}<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>  /**<a name="line.54"></a>
<span class="sourceLineNo">055</span>   * Returns a hash code for {@code value}; equal to the result of invoking<a name="line.55"></a>
<span class="sourceLineNo">056</span>   * {@code ((Byte) value).hashCode()}.<a name="line.56"></a>
<span class="sourceLineNo">057</span>   *<a name="line.57"></a>
<span class="sourceLineNo">058</span>   * @param value a primitive {@code byte} value<a name="line.58"></a>
<span class="sourceLineNo">059</span>   * @return a hash code for the value<a name="line.59"></a>
<span class="sourceLineNo">060</span>   */<a name="line.60"></a>
<span class="sourceLineNo">061</span>  public static int hashCode(byte value) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>    return value;<a name="line.62"></a>
<span class="sourceLineNo">063</span>  }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>  /**<a name="line.65"></a>
<span class="sourceLineNo">066</span>   * Returns {@code true} if {@code target} is present as an element anywhere in<a name="line.66"></a>
<span class="sourceLineNo">067</span>   * {@code array}.<a name="line.67"></a>
<span class="sourceLineNo">068</span>   *<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * @param array an array of {@code byte} values, possibly empty<a name="line.69"></a>
<span class="sourceLineNo">070</span>   * @param target a primitive {@code byte} value<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * @return {@code true} if {@code array[i] == target} for some value of {@code<a name="line.71"></a>
<span class="sourceLineNo">072</span>   *     i}<a name="line.72"></a>
<span class="sourceLineNo">073</span>   */<a name="line.73"></a>
<span class="sourceLineNo">074</span>  public static boolean contains(byte[] array, byte target) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>    for (byte value : array) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>      if (value == target) {<a name="line.76"></a>
<span class="sourceLineNo">077</span>        return true;<a name="line.77"></a>
<span class="sourceLineNo">078</span>      }<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span>    return false;<a name="line.80"></a>
<span class="sourceLineNo">081</span>  }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>  /**<a name="line.83"></a>
<span class="sourceLineNo">084</span>   * Returns the index of the first appearance of the value {@code target} in<a name="line.84"></a>
<span class="sourceLineNo">085</span>   * {@code array}.<a name="line.85"></a>
<span class="sourceLineNo">086</span>   *<a name="line.86"></a>
<span class="sourceLineNo">087</span>   * @param array an array of {@code byte} values, possibly empty<a name="line.87"></a>
<span class="sourceLineNo">088</span>   * @param target a primitive {@code byte} value<a name="line.88"></a>
<span class="sourceLineNo">089</span>   * @return the least index {@code i} for which {@code array[i] == target}, or<a name="line.89"></a>
<span class="sourceLineNo">090</span>   *     {@code -1} if no such index exists.<a name="line.90"></a>
<span class="sourceLineNo">091</span>   */<a name="line.91"></a>
<span class="sourceLineNo">092</span>  public static int indexOf(byte[] array, byte target) {<a name="line.92"></a>
<span class="sourceLineNo">093</span>    return indexOf(array, target, 0, array.length);<a name="line.93"></a>
<span class="sourceLineNo">094</span>  }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>  // TODO(kevinb): consider making this public<a name="line.96"></a>
<span class="sourceLineNo">097</span>  private static int indexOf(<a name="line.97"></a>
<span class="sourceLineNo">098</span>      byte[] array, byte target, int start, int end) {<a name="line.98"></a>
<span class="sourceLineNo">099</span>    for (int i = start; i &lt; end; i++) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>      if (array[i] == target) {<a name="line.100"></a>
<span class="sourceLineNo">101</span>        return i;<a name="line.101"></a>
<span class="sourceLineNo">102</span>      }<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span>    return -1;<a name="line.104"></a>
<span class="sourceLineNo">105</span>  }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>  /**<a name="line.107"></a>
<span class="sourceLineNo">108</span>   * Returns the start position of the first occurrence of the specified {@code<a name="line.108"></a>
<span class="sourceLineNo">109</span>   * target} within {@code array}, or {@code -1} if there is no such occurrence.<a name="line.109"></a>
<span class="sourceLineNo">110</span>   *<a name="line.110"></a>
<span class="sourceLineNo">111</span>   * &lt;p&gt;More formally, returns the lowest index {@code i} such that {@code<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly<a name="line.112"></a>
<span class="sourceLineNo">113</span>   * the same elements as {@code target}.<a name="line.113"></a>
<span class="sourceLineNo">114</span>   *<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * @param array the array to search for the sequence {@code target}<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * @param target the array to search for as a sub-sequence of {@code array}<a name="line.116"></a>
<span class="sourceLineNo">117</span>   */<a name="line.117"></a>
<span class="sourceLineNo">118</span>  public static int indexOf(byte[] array, byte[] target) {<a name="line.118"></a>
<span class="sourceLineNo">119</span>    checkNotNull(array, "array");<a name="line.119"></a>
<span class="sourceLineNo">120</span>    checkNotNull(target, "target");<a name="line.120"></a>
<span class="sourceLineNo">121</span>    if (target.length == 0) {<a name="line.121"></a>
<span class="sourceLineNo">122</span>      return 0;<a name="line.122"></a>
<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>    outer:<a name="line.125"></a>
<span class="sourceLineNo">126</span>    for (int i = 0; i &lt; array.length - target.length + 1; i++) {<a name="line.126"></a>
<span class="sourceLineNo">127</span>      for (int j = 0; j &lt; target.length; j++) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        if (array[i + j] != target[j]) {<a name="line.128"></a>
<span class="sourceLineNo">129</span>          continue outer;<a name="line.129"></a>
<span class="sourceLineNo">130</span>        }<a name="line.130"></a>
<span class="sourceLineNo">131</span>      }<a name="line.131"></a>
<span class="sourceLineNo">132</span>      return i;<a name="line.132"></a>
<span class="sourceLineNo">133</span>    }<a name="line.133"></a>
<span class="sourceLineNo">134</span>    return -1;<a name="line.134"></a>
<span class="sourceLineNo">135</span>  }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>  /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>   * Returns the index of the last appearance of the value {@code target} in<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * {@code array}.<a name="line.139"></a>
<span class="sourceLineNo">140</span>   *<a name="line.140"></a>
<span class="sourceLineNo">141</span>   * @param array an array of {@code byte} values, possibly empty<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * @param target a primitive {@code byte} value<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * @return the greatest index {@code i} for which {@code array[i] == target},<a name="line.143"></a>
<span class="sourceLineNo">144</span>   *     or {@code -1} if no such index exists.<a name="line.144"></a>
<span class="sourceLineNo">145</span>   */<a name="line.145"></a>
<span class="sourceLineNo">146</span>  public static int lastIndexOf(byte[] array, byte target) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>    return lastIndexOf(array, target, 0, array.length);<a name="line.147"></a>
<span class="sourceLineNo">148</span>  }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>  // TODO(kevinb): consider making this public<a name="line.150"></a>
<span class="sourceLineNo">151</span>  private static int lastIndexOf(<a name="line.151"></a>
<span class="sourceLineNo">152</span>      byte[] array, byte target, int start, int end) {<a name="line.152"></a>
<span class="sourceLineNo">153</span>    for (int i = end - 1; i &gt;= start; i--) {<a name="line.153"></a>
<span class="sourceLineNo">154</span>      if (array[i] == target) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>        return i;<a name="line.155"></a>
<span class="sourceLineNo">156</span>      }<a name="line.156"></a>
<span class="sourceLineNo">157</span>    }<a name="line.157"></a>
<span class="sourceLineNo">158</span>    return -1;<a name="line.158"></a>
<span class="sourceLineNo">159</span>  }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span>  /**<a name="line.161"></a>
<span class="sourceLineNo">162</span>   * Returns the values from each provided array combined into a single array.<a name="line.162"></a>
<span class="sourceLineNo">163</span>   * For example, {@code concat(new byte[] {a, b}, new byte[] {}, new<a name="line.163"></a>
<span class="sourceLineNo">164</span>   * byte[] {c}} returns the array {@code {a, b, c}}.<a name="line.164"></a>
<span class="sourceLineNo">165</span>   *<a name="line.165"></a>
<span class="sourceLineNo">166</span>   * @param arrays zero or more {@code byte} arrays<a name="line.166"></a>
<span class="sourceLineNo">167</span>   * @return a single array containing all the values from the source arrays, in<a name="line.167"></a>
<span class="sourceLineNo">168</span>   *     order<a name="line.168"></a>
<span class="sourceLineNo">169</span>   */<a name="line.169"></a>
<span class="sourceLineNo">170</span>  public static byte[] concat(byte[]... arrays) {<a name="line.170"></a>
<span class="sourceLineNo">171</span>    int length = 0;<a name="line.171"></a>
<span class="sourceLineNo">172</span>    for (byte[] array : arrays) {<a name="line.172"></a>
<span class="sourceLineNo">173</span>      length += array.length;<a name="line.173"></a>
<span class="sourceLineNo">174</span>    }<a name="line.174"></a>
<span class="sourceLineNo">175</span>    byte[] result = new byte[length];<a name="line.175"></a>
<span class="sourceLineNo">176</span>    int pos = 0;<a name="line.176"></a>
<span class="sourceLineNo">177</span>    for (byte[] array : arrays) {<a name="line.177"></a>
<span class="sourceLineNo">178</span>      System.arraycopy(array, 0, result, pos, array.length);<a name="line.178"></a>
<span class="sourceLineNo">179</span>      pos += array.length;<a name="line.179"></a>
<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
<span class="sourceLineNo">181</span>    return result;<a name="line.181"></a>
<span class="sourceLineNo">182</span>  }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>  /**<a name="line.184"></a>
<span class="sourceLineNo">185</span>   * Returns an array containing the same values as {@code array}, but<a name="line.185"></a>
<span class="sourceLineNo">186</span>   * guaranteed to be of a specified minimum length. If {@code array} already<a name="line.186"></a>
<span class="sourceLineNo">187</span>   * has a length of at least {@code minLength}, it is returned directly.<a name="line.187"></a>
<span class="sourceLineNo">188</span>   * Otherwise, a new array of size {@code minLength + padding} is returned,<a name="line.188"></a>
<span class="sourceLineNo">189</span>   * containing the values of {@code array}, and zeroes in the remaining places.<a name="line.189"></a>
<span class="sourceLineNo">190</span>   *<a name="line.190"></a>
<span class="sourceLineNo">191</span>   * @param array the source array<a name="line.191"></a>
<span class="sourceLineNo">192</span>   * @param minLength the minimum length the returned array must guarantee<a name="line.192"></a>
<span class="sourceLineNo">193</span>   * @param padding an extra amount to "grow" the array by if growth is<a name="line.193"></a>
<span class="sourceLineNo">194</span>   *     necessary<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * @throws IllegalArgumentException if {@code minLength} or {@code padding} is<a name="line.195"></a>
<span class="sourceLineNo">196</span>   *     negative<a name="line.196"></a>
<span class="sourceLineNo">197</span>   * @return an array containing the values of {@code array}, with guaranteed<a name="line.197"></a>
<span class="sourceLineNo">198</span>   *     minimum length {@code minLength}<a name="line.198"></a>
<span class="sourceLineNo">199</span>   */<a name="line.199"></a>
<span class="sourceLineNo">200</span>  public static byte[] ensureCapacity(<a name="line.200"></a>
<span class="sourceLineNo">201</span>      byte[] array, int minLength, int padding) {<a name="line.201"></a>
<span class="sourceLineNo">202</span>    checkArgument(minLength &gt;= 0, "Invalid minLength: %s", minLength);<a name="line.202"></a>
<span class="sourceLineNo">203</span>    checkArgument(padding &gt;= 0, "Invalid padding: %s", padding);<a name="line.203"></a>
<span class="sourceLineNo">204</span>    return (array.length &lt; minLength)<a name="line.204"></a>
<span class="sourceLineNo">205</span>        ? copyOf(array, minLength + padding)<a name="line.205"></a>
<span class="sourceLineNo">206</span>        : array;<a name="line.206"></a>
<span class="sourceLineNo">207</span>  }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>  // Arrays.copyOf() requires Java 6<a name="line.209"></a>
<span class="sourceLineNo">210</span>  private static byte[] copyOf(byte[] original, int length) {<a name="line.210"></a>
<span class="sourceLineNo">211</span>    byte[] copy = new byte[length];<a name="line.211"></a>
<span class="sourceLineNo">212</span>    System.arraycopy(original, 0, copy, 0, Math.min(original.length, length));<a name="line.212"></a>
<span class="sourceLineNo">213</span>    return copy;<a name="line.213"></a>
<span class="sourceLineNo">214</span>  }<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span>  /**<a name="line.216"></a>
<span class="sourceLineNo">217</span>   * Returns an array containing each value of {@code collection}, converted to<a name="line.217"></a>
<span class="sourceLineNo">218</span>   * a {@code byte} value in the manner of {@link Number#byteValue}.<a name="line.218"></a>
<span class="sourceLineNo">219</span>   *<a name="line.219"></a>
<span class="sourceLineNo">220</span>   * &lt;p&gt;Elements are copied from the argument collection as if by {@code<a name="line.220"></a>
<span class="sourceLineNo">221</span>   * collection.toArray()}.  Calling this method is as thread-safe as calling<a name="line.221"></a>
<span class="sourceLineNo">222</span>   * that method.<a name="line.222"></a>
<span class="sourceLineNo">223</span>   *<a name="line.223"></a>
<span class="sourceLineNo">224</span>   * @param collection a collection of {@code Number} instances<a name="line.224"></a>
<span class="sourceLineNo">225</span>   * @return an array containing the same values as {@code collection}, in the<a name="line.225"></a>
<span class="sourceLineNo">226</span>   *     same order, converted to primitives<a name="line.226"></a>
<span class="sourceLineNo">227</span>   * @throws NullPointerException if {@code collection} or any of its elements<a name="line.227"></a>
<span class="sourceLineNo">228</span>   *     is null<a name="line.228"></a>
<span class="sourceLineNo">229</span>   * @since 1.0 (parameter was {@code Collection&lt;Byte&gt;} before 12.0)<a name="line.229"></a>
<span class="sourceLineNo">230</span>   */<a name="line.230"></a>
<span class="sourceLineNo">231</span>  public static byte[] toArray(Collection&lt;? extends Number&gt; collection) {<a name="line.231"></a>
<span class="sourceLineNo">232</span>    if (collection instanceof ByteArrayAsList) {<a name="line.232"></a>
<span class="sourceLineNo">233</span>      return ((ByteArrayAsList) collection).toByteArray();<a name="line.233"></a>
<span class="sourceLineNo">234</span>    }<a name="line.234"></a>
<span class="sourceLineNo">235</span><a name="line.235"></a>
<span class="sourceLineNo">236</span>    Object[] boxedArray = collection.toArray();<a name="line.236"></a>
<span class="sourceLineNo">237</span>    int len = boxedArray.length;<a name="line.237"></a>
<span class="sourceLineNo">238</span>    byte[] array = new byte[len];<a name="line.238"></a>
<span class="sourceLineNo">239</span>    for (int i = 0; i &lt; len; i++) {<a name="line.239"></a>
<span class="sourceLineNo">240</span>      // checkNotNull for GWT (do not optimize)<a name="line.240"></a>
<span class="sourceLineNo">241</span>      array[i] = ((Number) checkNotNull(boxedArray[i])).byteValue();<a name="line.241"></a>
<span class="sourceLineNo">242</span>    }<a name="line.242"></a>
<span class="sourceLineNo">243</span>    return array;<a name="line.243"></a>
<span class="sourceLineNo">244</span>  }<a name="line.244"></a>
<span class="sourceLineNo">245</span><a name="line.245"></a>
<span class="sourceLineNo">246</span>  /**<a name="line.246"></a>
<span class="sourceLineNo">247</span>   * Returns a fixed-size list backed by the specified array, similar to {@link<a name="line.247"></a>
<span class="sourceLineNo">248</span>   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)},<a name="line.248"></a>
<span class="sourceLineNo">249</span>   * but any attempt to set a value to {@code null} will result in a {@link<a name="line.249"></a>
<span class="sourceLineNo">250</span>   * NullPointerException}.<a name="line.250"></a>
<span class="sourceLineNo">251</span>   *<a name="line.251"></a>
<span class="sourceLineNo">252</span>   * &lt;p&gt;The returned list maintains the values, but not the identities, of<a name="line.252"></a>
<span class="sourceLineNo">253</span>   * {@code Byte} objects written to or read from it.  For example, whether<a name="line.253"></a>
<span class="sourceLineNo">254</span>   * {@code list.get(0) == list.get(0)} is true for the returned list is<a name="line.254"></a>
<span class="sourceLineNo">255</span>   * unspecified.<a name="line.255"></a>
<span class="sourceLineNo">256</span>   *<a name="line.256"></a>
<span class="sourceLineNo">257</span>   * @param backingArray the array to back the list<a name="line.257"></a>
<span class="sourceLineNo">258</span>   * @return a list view of the array<a name="line.258"></a>
<span class="sourceLineNo">259</span>   */<a name="line.259"></a>
<span class="sourceLineNo">260</span>  public static List&lt;Byte&gt; asList(byte... backingArray) {<a name="line.260"></a>
<span class="sourceLineNo">261</span>    if (backingArray.length == 0) {<a name="line.261"></a>
<span class="sourceLineNo">262</span>      return Collections.emptyList();<a name="line.262"></a>
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<span class="sourceLineNo">264</span>    return new ByteArrayAsList(backingArray);<a name="line.264"></a>
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<span class="sourceLineNo">266</span><a name="line.266"></a>
<span class="sourceLineNo">267</span>  @GwtCompatible<a name="line.267"></a>
<span class="sourceLineNo">268</span>  private static class ByteArrayAsList extends AbstractList&lt;Byte&gt;<a name="line.268"></a>
<span class="sourceLineNo">269</span>      implements RandomAccess, Serializable {<a name="line.269"></a>
<span class="sourceLineNo">270</span>    final byte[] array;<a name="line.270"></a>
<span class="sourceLineNo">271</span>    final int start;<a name="line.271"></a>
<span class="sourceLineNo">272</span>    final int end;<a name="line.272"></a>
<span class="sourceLineNo">273</span><a name="line.273"></a>
<span class="sourceLineNo">274</span>    ByteArrayAsList(byte[] array) {<a name="line.274"></a>
<span class="sourceLineNo">275</span>      this(array, 0, array.length);<a name="line.275"></a>
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<span class="sourceLineNo">277</span><a name="line.277"></a>
<span class="sourceLineNo">278</span>    ByteArrayAsList(byte[] array, int start, int end) {<a name="line.278"></a>
<span class="sourceLineNo">279</span>      this.array = array;<a name="line.279"></a>
<span class="sourceLineNo">280</span>      this.start = start;<a name="line.280"></a>
<span class="sourceLineNo">281</span>      this.end = end;<a name="line.281"></a>
<span class="sourceLineNo">282</span>    }<a name="line.282"></a>
<span class="sourceLineNo">283</span><a name="line.283"></a>
<span class="sourceLineNo">284</span>    @Override public int size() {<a name="line.284"></a>
<span class="sourceLineNo">285</span>      return end - start;<a name="line.285"></a>
<span class="sourceLineNo">286</span>    }<a name="line.286"></a>
<span class="sourceLineNo">287</span><a name="line.287"></a>
<span class="sourceLineNo">288</span>    @Override public boolean isEmpty() {<a name="line.288"></a>
<span class="sourceLineNo">289</span>      return false;<a name="line.289"></a>
<span class="sourceLineNo">290</span>    }<a name="line.290"></a>
<span class="sourceLineNo">291</span><a name="line.291"></a>
<span class="sourceLineNo">292</span>    @Override public Byte get(int index) {<a name="line.292"></a>
<span class="sourceLineNo">293</span>      checkElementIndex(index, size());<a name="line.293"></a>
<span class="sourceLineNo">294</span>      return array[start + index];<a name="line.294"></a>
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<span class="sourceLineNo">296</span><a name="line.296"></a>
<span class="sourceLineNo">297</span>    @Override public boolean contains(Object target) {<a name="line.297"></a>
<span class="sourceLineNo">298</span>      // Overridden to prevent a ton of boxing<a name="line.298"></a>
<span class="sourceLineNo">299</span>      return (target instanceof Byte)<a name="line.299"></a>
<span class="sourceLineNo">300</span>          &amp;&amp; Bytes.indexOf(array, (Byte) target, start, end) != -1;<a name="line.300"></a>
<span class="sourceLineNo">301</span>    }<a name="line.301"></a>
<span class="sourceLineNo">302</span><a name="line.302"></a>
<span class="sourceLineNo">303</span>    @Override public int indexOf(Object target) {<a name="line.303"></a>
<span class="sourceLineNo">304</span>      // Overridden to prevent a ton of boxing<a name="line.304"></a>
<span class="sourceLineNo">305</span>      if (target instanceof Byte) {<a name="line.305"></a>
<span class="sourceLineNo">306</span>        int i = Bytes.indexOf(array, (Byte) target, start, end);<a name="line.306"></a>
<span class="sourceLineNo">307</span>        if (i &gt;= 0) {<a name="line.307"></a>
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<span class="sourceLineNo">311</span>      return -1;<a name="line.311"></a>
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<span class="sourceLineNo">313</span><a name="line.313"></a>
<span class="sourceLineNo">314</span>    @Override public int lastIndexOf(Object target) {<a name="line.314"></a>
<span class="sourceLineNo">315</span>      // Overridden to prevent a ton of boxing<a name="line.315"></a>
<span class="sourceLineNo">316</span>      if (target instanceof Byte) {<a name="line.316"></a>
<span class="sourceLineNo">317</span>        int i = Bytes.lastIndexOf(array, (Byte) target, start, end);<a name="line.317"></a>
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<span class="sourceLineNo">319</span>          return i - start;<a name="line.319"></a>
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<span class="sourceLineNo">323</span>    }<a name="line.323"></a>
<span class="sourceLineNo">324</span><a name="line.324"></a>
<span class="sourceLineNo">325</span>    @Override public Byte set(int index, Byte element) {<a name="line.325"></a>
<span class="sourceLineNo">326</span>      checkElementIndex(index, size());<a name="line.326"></a>
<span class="sourceLineNo">327</span>      byte oldValue = array[start + index];<a name="line.327"></a>
<span class="sourceLineNo">328</span>      // checkNotNull for GWT (do not optimize)<a name="line.328"></a>
<span class="sourceLineNo">329</span>      array[start + index] = checkNotNull(element);<a name="line.329"></a>
<span class="sourceLineNo">330</span>      return oldValue;<a name="line.330"></a>
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<span class="sourceLineNo">332</span><a name="line.332"></a>
<span class="sourceLineNo">333</span>    @Override public List&lt;Byte&gt; subList(int fromIndex, int toIndex) {<a name="line.333"></a>
<span class="sourceLineNo">334</span>      int size = size();<a name="line.334"></a>
<span class="sourceLineNo">335</span>      checkPositionIndexes(fromIndex, toIndex, size);<a name="line.335"></a>
<span class="sourceLineNo">336</span>      if (fromIndex == toIndex) {<a name="line.336"></a>
<span class="sourceLineNo">337</span>        return Collections.emptyList();<a name="line.337"></a>
<span class="sourceLineNo">338</span>      }<a name="line.338"></a>
<span class="sourceLineNo">339</span>      return new ByteArrayAsList(array, start + fromIndex, start + toIndex);<a name="line.339"></a>
<span class="sourceLineNo">340</span>    }<a name="line.340"></a>
<span class="sourceLineNo">341</span><a name="line.341"></a>
<span class="sourceLineNo">342</span>    @Override public boolean equals(Object object) {<a name="line.342"></a>
<span class="sourceLineNo">343</span>      if (object == this) {<a name="line.343"></a>
<span class="sourceLineNo">344</span>        return true;<a name="line.344"></a>
<span class="sourceLineNo">345</span>      }<a name="line.345"></a>
<span class="sourceLineNo">346</span>      if (object instanceof ByteArrayAsList) {<a name="line.346"></a>
<span class="sourceLineNo">347</span>        ByteArrayAsList that = (ByteArrayAsList) object;<a name="line.347"></a>
<span class="sourceLineNo">348</span>        int size = size();<a name="line.348"></a>
<span class="sourceLineNo">349</span>        if (that.size() != size) {<a name="line.349"></a>
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<span class="sourceLineNo">351</span>        }<a name="line.351"></a>
<span class="sourceLineNo">352</span>        for (int i = 0; i &lt; size; i++) {<a name="line.352"></a>
<span class="sourceLineNo">353</span>          if (array[start + i] != that.array[that.start + i]) {<a name="line.353"></a>
<span class="sourceLineNo">354</span>            return false;<a name="line.354"></a>
<span class="sourceLineNo">355</span>          }<a name="line.355"></a>
<span class="sourceLineNo">356</span>        }<a name="line.356"></a>
<span class="sourceLineNo">357</span>        return true;<a name="line.357"></a>
<span class="sourceLineNo">358</span>      }<a name="line.358"></a>
<span class="sourceLineNo">359</span>      return super.equals(object);<a name="line.359"></a>
<span class="sourceLineNo">360</span>    }<a name="line.360"></a>
<span class="sourceLineNo">361</span><a name="line.361"></a>
<span class="sourceLineNo">362</span>    @Override public int hashCode() {<a name="line.362"></a>
<span class="sourceLineNo">363</span>      int result = 1;<a name="line.363"></a>
<span class="sourceLineNo">364</span>      for (int i = start; i &lt; end; i++) {<a name="line.364"></a>
<span class="sourceLineNo">365</span>        result = 31 * result + Bytes.hashCode(array[i]);<a name="line.365"></a>
<span class="sourceLineNo">366</span>      }<a name="line.366"></a>
<span class="sourceLineNo">367</span>      return result;<a name="line.367"></a>
<span class="sourceLineNo">368</span>    }<a name="line.368"></a>
<span class="sourceLineNo">369</span><a name="line.369"></a>
<span class="sourceLineNo">370</span>    @Override public String toString() {<a name="line.370"></a>
<span class="sourceLineNo">371</span>      StringBuilder builder = new StringBuilder(size() * 5);<a name="line.371"></a>
<span class="sourceLineNo">372</span>      builder.append('[').append(array[start]);<a name="line.372"></a>
<span class="sourceLineNo">373</span>      for (int i = start + 1; i &lt; end; i++) {<a name="line.373"></a>
<span class="sourceLineNo">374</span>        builder.append(", ").append(array[i]);<a name="line.374"></a>
<span class="sourceLineNo">375</span>      }<a name="line.375"></a>
<span class="sourceLineNo">376</span>      return builder.append(']').toString();<a name="line.376"></a>
<span class="sourceLineNo">377</span>    }<a name="line.377"></a>
<span class="sourceLineNo">378</span><a name="line.378"></a>
<span class="sourceLineNo">379</span>    byte[] toByteArray() {<a name="line.379"></a>
<span class="sourceLineNo">380</span>      // Arrays.copyOfRange() is not available under GWT<a name="line.380"></a>
<span class="sourceLineNo">381</span>      int size = size();<a name="line.381"></a>
<span class="sourceLineNo">382</span>      byte[] result = new byte[size];<a name="line.382"></a>
<span class="sourceLineNo">383</span>      System.arraycopy(array, start, result, 0, size);<a name="line.383"></a>
<span class="sourceLineNo">384</span>      return result;<a name="line.384"></a>
<span class="sourceLineNo">385</span>    }<a name="line.385"></a>
<span class="sourceLineNo">386</span><a name="line.386"></a>
<span class="sourceLineNo">387</span>    private static final long serialVersionUID = 0;<a name="line.387"></a>
<span class="sourceLineNo">388</span>  }<a name="line.388"></a>
<span class="sourceLineNo">389</span>}<a name="line.389"></a>




























































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